Lock-valve.



No. 712,237. I Patentedfict. 28,1902. 7 w. H. BAKER.

LOCK VALVE.

(Application filed Nov. 22, 1991.)

(No llodel.)

IN VENTOI? UNITED STATES- PATENT OFFICE.

WILLIAM HENRY BAKER, OF NEW YORK, N. Y.

LOCK-VALVE.

SPECIFICATION forming part of Letters Patent No. 712,237, dated October 28, 1902. A plication filed November 22, 1901. Serial No. 83,272. (No model.)

To all whom it may concern.-

Be it known that LWILLIAM HENRY BAKER, a citizen of the United States, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and useful Improvement in Lock-Valves, of which the following is a full, clear, and exact description.

My invention relates to a double-acting combination-lock valve for use upon pipes for Water, gas, air, 850.

One application of my invention is to gaspipes in the immediate vicinity of meters for the purpose of preventing dishonest persons from using the gas without the same having passed through the meter. Other applications will suggest themselves to persons skilled in the art.

The invention consists'in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claim.

Reference is to be had to the accompanying drawings, forminga part of this specification,

in which similar characters of reference indi-' cate corresponding parts in all the figures.

Figure 1 is a vertical cross-section of my device. Fig. 2 is an inverted plan view showing the device with the cap removed and with a part in section. Fig. 3 is a longitudinal section on the line 3 3 of Fig. 2. Fig. 4 is a section on the line 4 4 of Fig. 1. Fig. 5 is a perspective view of the cap for inclosing certain movable details hereinafter more fully described, and Fig. 6 is a perspective view of the key-post forming a part of the lock.

The valve-casing 1 may be secured to appropriate pipes in the usual manner. For instance, a flanged pipe 2 may be abutted against the casing and held by a screw-cap 3, provided with a packing 4, or the valve-casing may be screwed directly upon a pipe by means of screw-threads 5, as shown in Fig. 3. Any other means, however, may be employed for securing the valve-casing to the pipes. The casing 1 is provided with shoulders or stops 6 and with apertures 7. Revolubly fitted in the valve-casing is a plug 8, provided with a central opening or aperture 9 for the passage of fluids and also provided with a plate 10, through which passes a screw 11,

engaged by a nut 12, for holding the plug in position. A cap 13 is fitted into the casing and is provided with integral lugs 14 for the purpose of engaging the stops 6, and thereby limiting the movements of the plug. The cap 13 is provided with projecting walls 16 integral therewith, the same forming an angular nut for the purpose of being engaged by a wrench, whereby the cap can be rotated. Between these walls is an aperture 15 for the insertion of a key, and leading from this aperture is a pair of slots 17, (see Fig. 5,)

through which the key 18 is free to pass.

The plug Sis provided with a pair of posts 19, upon the bases of which are shoulders 19, engaged by appropriate notches in the key, and the posts serve as guides for holding the cap and plug in the proper relative position. The conical part of the plug is secured to the cap by means of screws 20, as shown more particularly in Fig. 1. Located within the hollow portion of the plug are a pair of slidably-mounted .bolts 21, provided with slots 22 and engaging fixed posts 23, which posts act as guides for the bolts and should be sufficiently strong to stand a considerable strain. The outer portions 24 of the bolts engage the body of the plug and are free to slide'against the same, as indicated in Fig. 4.

A revoluble key-post 25 is provided with flanges 26 27 and with slots 28 for the purposeof engaging the key. The key is split at the end, as shown in Fig. 1, and the two members thus formed straddle the center of the key-post.

The lock is provided with two pairs of tumblers 29 and 30, which are pivoted upon one of the posts 19 and are free to move into close proximity with the other of said posts. These tumblers are held normally in the position shown in Fig. 2 by means of bow-shaped springs 31. By the insertion and rotation of the key these tumblers may all be moved asunder, so that the bolts may be thrown. The outer ends 33 of the tumblers normally engage the lugs 34, which are integral with the bolts, and thus prevent the bolts from being moved improperlythat is to say, the bolts cannot be thrown either outward or inward until the tumblers are moved asunder and for the reason that the lugs 34 will not side of the lock be picked-that is to say,

should two of the tumblers be displaced-the other two tumblers will hold the other bolt in position. If three of the tumblers could be displaced by picking the lock and one of the tumblers remain in place, the valve could not be moved. The outer ends of the casing are provided with projections or lugs 35 for the purpose of making room for the recesses 7, and thereby accommodating the bolts.

The operation of my device is quite simple. The key 18 is inserted and turned. This key is provided with notches which engage the tumblers 29 and 30, moving the same out of the way and leaving the bolts free to move. The rotation of the key thereupon throws the bolts inward or outward in the usual manner. This locking-valve therefore embodies a true combination-lock, in that several tumblers must be moved by different parts of the key in order that the bolts may be free to slide. The lock is double-acting, in that it has two bolts sliding in opposite directions, the said bolts being to some extent independent, so that the picking of a part of the lock will not allow the valve to be actuated.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- A lock-valve comprising a valve-casing, a plug revolubly mounted within said casing and provided witha pair of cylindrical posts,

said posts having shoulders to be engaged by the notches of a key, a cap fitted upon said plug and provided with holes engaging said cylindrical posts, the arrangement being such that said cap is unable to turn without rotating said plug, a plurality of tumblers arranged in pairs and pivotally mounted upon one of said posts so as to normally engage the other of said posts which forms a limitingstop therefor, a single spring engaging each pair of tumblers, apair of bolts provided with apertures and slidably mounted between said cap and said plug, said bolts being separated from each other by said cylindrical posts and being provided with longitudinal slots, a pair of flat posts mounted upon said plug and engaging said slots for the purpose of guiding said bolts, and a revoluble key-post disposed intermediate of said flat posts and also intermediate of said cylindrical posts and provided with a keyway for guiding a key centrally between all of said posts and into engagement with said apertures in said bolts and with said shoulders of said cylindrical posts. In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WM. HENRY BAKER.

WVitnesses:

A. S. VOGAN, S. C. NOXON. 

